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A slick of nude coloured lipstick was enough to plump up her pout while lashings of dark mascara added drama to her eyes.

She completed her evening look with a pair of black pumps and happily twisted and turned as she posed for the flashbulbs at the première of the third and final instalment in the successful movie franchise.

Bargain: The 28-year-old ditched designer labels in favour of an AU$66 ASOS frock

Taking the plunge: The budget dress featured a dangerously low-cut neckline and glittering skirt

Enough sparkle: Wearing few accessories, she teamed the striking design with a pair of black pumps

Amid the bright lights of the premiere Rebel had her homeland at heart after the news of a deadly siege in the heart of Sydney broke on Monday.

'Thinking of everyone in Sydney today x' she wrote on Twitter, sparking an outpouring of prayers and heartfelt messages from some of her nearly two million followers.

Rebel worked alongside late actor Robin Williams on Night At The Museum and recently told KIISFM she was overcome with emotion watching the comedic genius' final scenes.

The emotive scene, which sees Robin playing US President Theodore Roosevelt, was all the more poignant because of the parallels that could be drawn between the end of his life and his character's.

Pray for Sydney: Rebel's homeland was close to her heart as her thoughts were with the people involved in the tragic Sydney siege

Simple beauty look: She wore a slick of nude lipstick and plenty of dark mascara

'It's just so emotional because in the movie his character knows he's not going to be alive the next day and he gives this speech and it was just me and my assistant Katie just sitting in this screening room just crying,' said the actress.

'It's super, super emotional.'

Blessed with the opportunity of working with the lauded American actor Rebel said that although the pair did not film any scenes together, he still took the time to connect with her whilst shooting in London.

'He watched me in a scene with Ben Stiller and called me over to his trailer afterwards and he just said, "I think you're such a great improviser and you're so funny", she revealed.

Up in lights: Regent Street was decorated with images from the film in honour of the premiere